/* Part of XPCE --- The SWI-Prolog GUI toolkit Author: Jan Wielemaker and Anjo Anjewierden E-mail: jan@swi.psy.uva.nl WWW: http://www.swi.psy.uva.nl/projects/xpce/ Copyright (c) 2002-2011, University of Amsterdam All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ :- module(pce_print_text, []). :- use_module(library(pce)). /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - This module extends class text_buffer with the ->print method, dealing with printing plain text. This issue is completely different when comparing Windows and Unix. Windows ======= We create an editor and print the image thereof on a win_printer, page by page. Unix ==== There are many options here, unfortunately none is very standard. You can pipe the output directly through the lpr command, use an external beautifier that creates nice-looking PostScript, such as nenscript, mpage or aps or create the PostScript yourself. At the moment, class text_image does not provide for generating PostScript, so this is not yet an option. To keep things simple we pipe through lpr and leave the details to the lpr installation. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ :- pce_extend_class(text_buffer). print(TB, From:from=[int], To:to=[int], JobName:job=[name], Editor:editor=[editor], Font:font=[font]) :-> "Print (region of) the text-buffer":: get(TB, size, Size), default(From, 0, F), default(To, Size, T), ( get(@pce, convert, win_printer, class, _) -> send(TB, win_print, F, T, JobName, Editor, Font) ; send(TB, unix_print, F, T, JobName, Editor, Font) ). /******************************* * WINDOWS PRINTING * *******************************/ win_print(TB, From:int, To:int, JobName:[name], Editor:[editor], Font:[font]) :-> new(Prt, win_printer(JobName)), ( Editor \== @default, get(Editor, frame, Frame) -> true ; Frame = @default ), send(Prt, setup, Frame), ( send(Prt, open) -> true ; send(TB, report, error, 'Failed to open printer'), fail ), new(E, editor(TB, 80)), send(E?image, elevation, @nil), send(E?image, pen, 0), send(TB, setup_print_editor, E, Editor), ( Font \== @default -> send(E, font, Font) ; true ), get(E?area, width, Width), get(Prt, size, size(W,H)), get(Prt, dots_per_inch, size(DPIX,DPIY)), InchW is W/DPIX, InchH is H/DPIY, PageW is round(Width*(InchW/(InchW-2))), % 1 inch margin PageH is round(PageW*(H/W)), send(Prt, resolution, PageH), Height is round(PageH*((InchH-2)/InchH)), LDPI is round(PageH/InchH), send(E, do_set, 0, 0, Width, Height), new(BG, device), % background ( JobName \== @default -> send(BG, display, new(T, text(JobName))), send(BG, display, new(P, text)), send(P, name, pageno), get(T, height, TH), BT is LDPI-TH/2, Right is LDPI+Width, send(T, position, point(LDPI, BT-TH)), send(P, position, point(Right, BT-TH)), send(BG, display, line(LDPI, BT, Right, BT)), send(BG, attribute, page_right, Right) ; true ), send(E, scroll_to, From, 1), print_pages(Prt, E, To, margin(LDPI,LDPI), BG, 1, Pages), send(TB, report, status, 'Sent %d pages to the printer', Pages), send(Prt, close), send(E, destroy). setup_print_editor(_TB, E:editor, From:[editor]) :-> "Get defaults from editor":: ( From \== @default -> get(From, styles, Styles), send(Styles, for_all, message(E, style, @arg1?name, @arg1?value)), get(From, font, Font), send(E, font, Font) ; true ). %! print_pages(+Printer, +Editor, +EndIndex, +Margin, %! +Background, +Page, -LastPage) is det. % % Actual page printing loop. % % @param Margin Term margin(+X,+Y) representing the page margins print_pages(Printer, Editor, End, Margin, BG, Page, Pages) :- get(Editor, image, Image), Margin = margin(MX, MY), ( get(BG, member, pageno, PageNoText) -> send(PageNoText, string, string('%s %d', page?label_name, Page)), get(BG, page_right, Right), send(PageNoText, x, Right-PageNoText?width) ; true ), send(Printer, draw_in, BG), get(Image, end, EndImg), ( EndImg > End -> get(Image, start, Start), get(Image, character_position, End, point(_,BaseY)), send(Editor, do_set, height := BaseY), send(Editor, scroll_to, Start, 1) % make sure it doesn't move ; true ), send(Printer, draw_in, Image, point(MX, MY)), ( ( EndImg >= End ; get(Image, eof_in_window, @on) ) -> Pages = Page ; send(Printer, next_page), send(Editor, scroll_to, EndImg, 1), NextPage is Page+1, print_pages(Printer, Editor, End, Margin, BG, NextPage, Pages) ). /******************************* * UNIX PRINTING * *******************************/ unix_print(TB, From:int, To:int, _JobName:[name], Editor:[editor], _Font:[font]) :-> "Print on Unix printer":: ( getenv('PRINTER', LP) -> true ; LP = lp ), atom_concat('lpr -P', LP, DefCommand), new(D, dialog(print_command?label_name)), send(D, append, new(TI, text_item(command, DefCommand))), send(D, append, button(print, message(D, return, TI?selection))), send(D, append, button(cancel, message(D, destroy))), send(D, default_button, print), ( Editor \== @default, get(Editor, frame, Frame) -> send(D, transient_for, Frame), send(D, modal, transient), get(Frame?area, center, Center) ; Center = @default ), get(D, confirm_centered, Center, Command), send(D, destroy), get(TB, contents, From, To-From, String), get(String, value, Atom), catch(do_print(Command, Atom), E, ( message_to_string(E, Msg), send(TB, report, error, Msg))), send(TB, report, status, 'Document sent to printer'). do_print(Command, Text) :- open(pipe(Command), write, Out), write(Out, Text), close(Out). :- pce_end_class. /* test :- new(TB, text_buffer), send(TB, insert_file, 0, 'print_text.pl'), send(TB, try_print, job := 'Test me'). test(To) :- new(TB, text_buffer), send(TB, insert_file, 0, 'print_text.pl'), send(TB, try_print, to := To, job := 'Test me'). */